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針對 RAM 而非 CPU 消耗進行最佳化的匹配

tag-icon • tag-icon microsoft-excel memory cpu performance vba
針對 RAM 而非 CPU 消耗進行最佳化的匹配

我正在尋找不同的方法來獲取另一個範圍中相同單元格的行號。

最快的方法之一是使用 Match 函數。當運行兩個非常大的範圍（每個範圍超過 500,000 行）時，它將（預設）在 CPU 上並行運行，並且如果 CPU 性能良好，運行速度會非常快。然而，當 CPU 較弱或核心數很少（或不支援多執行緒）時，這可能需要很長時間。它幾乎不使用 RAM。

是否有比賽類型使用大量 RAM 但很少使用 CPU？這對於擁有大量記憶體但 CPU 較舊的電腦非常有用。

答案1

我知道有 4 種搜尋方法，但我認為決定因素始終是 CPU

考試：

- out of the max of 1048576
- find cell        A1048573

沒有什麼能與 Match 相提並論

Time -   LookupAppMatch(): 0.047 sec      CPU usage 1%
Time -   LookupAppMatch(): 0.031 sec      CPU usage 0%
Time -   LookupAppMatch(): 0.031 sec      CPU usage 1%

Time -    LookupWSMatch(): 0.047 sec      CPU usage 1%
Time -    LookupWSMatch(): 0.063 sec      CPU usage 0%
Time -    LookupWSMatch(): 0.047 sec      CPU usage 0%

Time -       LookupFind(): 0.672 sec      CPU usage 8%
Time -       LookupFind(): 0.625 sec      CPU usage 5%
Time -       LookupFind(): 0.625 sec      CPU usage 7%

Time -    LookupForLoop(): 0.297 sec      CPU usage 5%
Time -    LookupForLoop(): 0.297 sec      CPU usage 3%
Time -    LookupForLoop(): 0.297 sec      CPU usage 3%

Time - LookupAutoFilter(): 0.672 sec      CPU usage 7%
Time - LookupAutoFilter(): 0.359 sec      CPU usage 5%
Time - LookupAutoFilter(): 0.375 sec      CPU usage 7%

代碼：

Option Explicit

Private Const FND = "A1048573"
Private t As Double

Public Sub SetupData()
    Sheet1.Columns(1).Formula = "=Address(Row(), Column(), 4)"
End Sub

Public Sub LookupAppMatch()
    t = Timer
    Sheet1.Cells(1, 2) = Application.Match(FND, Sheet1.Columns(1), 0)
    Debug.Print "Time -   LookupAppMatch(): " & Format(Timer - t, "0.000") & " sec"
End Sub

Public Sub LookupWSMatch()
    t = Timer
    Sheet1.Cells(2, 2) = WorksheetFunction.Match(FND, Sheet1.Columns(1), 0)
    Debug.Print "Time -    LookupWSMatch(): " & Format(Timer - t, "0.000") & " sec"
End Sub

Public Sub LookupFind()
    t = Timer
    Sheet1.Cells(3, 2) = Sheet1.Columns(1).Find(What:=FND, LookIn:=xlValues, LookAt:=xlWhole, MatchCase:=True).Row
    Debug.Print "Time -       LookupFind(): " & Format(Timer - t, "0.000") & " sec"
End Sub

Public Sub LookupForLoop()
    Dim ur As Variant, r As Long
    t = Timer
    ur = Sheet1.Columns(1)
    For r = 1 To UBound(ur)
        If ur(r, 1) = FND Then Exit For
    Next
    Sheet1.Cells(4, 2) = r
    Debug.Print "Time -    LookupForLoop(): " & Format(Timer - t, "0.000") & " sec"
End Sub

Public Sub LookupAutoFilter()
    t = Timer
    Application.ScreenUpdating = False
    With Sheet1.Columns(1)
        .AutoFilter Field:=1, Criteria1:=FND
        Sheet1.Cells(5, 2) = .Rows.Count - .SpecialCells(xlVisible).Cells.CountLarge - 1
        .AutoFilter
    End With
    Application.ScreenUpdating = True
    Debug.Print "Time - LookupAutoFilter(): " & Format(Timer - t, "0.000") & " sec"
End Sub

更多細節這裡和這裡

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